He thinks it smells and tastes good. (Dogs are notoriously poor arbiters of taste.)

He’s hungry.

He may be missing key nutrients in his diet or suffer malabsorption.

He likes to keep his territory or bedding clean.

He has fun playing with it. (This is especially true for dogs that are mouthy.)

He’s bored.

He knows that removing the evidence means no punishment for inappropriate elimination.

He knows that fewer predators will give him grief if there is no physical evidence of his having been around.

There may be other reasons for routine coprophagy, as the condition is known. It can be hard to figure out why a dog chooses to eat poop, but if the problem persists, ask your veterinarian about a remedy for this habit. What veterinarians do know is that it is normal behavior for a wide variety of species — even if humans are revolted by the very idea.